You could use them in automotive, the chips are very reliable if you design the hardware right and the programming is robust.If you operate across wide temperature ranges, you need to run RF calibration more often on power-up. The entire board design and components also start to matter a lot.As for EMI - it is a two-way road. If your design puts out a lot of EM emissions, then it would also absorb a lot of it from other devices. So by ensuring a layout where you do not radiate a lot of EM waves out of your design, you can ensure that the design is EMI immune as well.

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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. We are the manufacturer of ESP8266EX.